Spark Plug Change - How To

[samwichse]

The 4 different part numbers are for the 4 different index directions.

ABCD

You can have any combination of these, mine was BBA

[academytim]

Originally Posted by firsthonda

I hope so. The article says there are 4 different part numbers which makes sense for a 4 cylinder; even with 2 plugs per cylinder. The Insight 1 is a 3 cylinder.

You guys are probably right but I think this needs to be researched further; just to be sure.

And I agree. Based on the plug in the pic, I think we can go considerably longer than 100,000 miles to change the plugs. Remember, a good portion of the time with our cars, the plugs aren't firing. I think a good practice is to remove one of the plugs in the front to check the condition at 100k; then every 15-20k miles thereafter. When it looks like it needs it, then change all the plugs.

You guys got me to second guess myself so I looked at every plug that was removed. They are all exactly the same down to the part # that is printed on them. I guess that's good news for I2 owners as that means cheaper tune ups when the time comes. I agree that they could have gone a bit further, but by the time I had everything apart to do it, I wasn't about to put the old ones back in.

[Cobb]

Now we got another eco mod, indexed plugs!!!!!

If they werent soo expensive and the fact we needed twice as many Id consider buying a set of colder plugs just for testing purposes. This is something I have done with my previous vehicles as I generally push the timing as far as the dizzy will go.

Just think previously I use to turn down the timing when it started knocking under full load.


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[firsthonda]

Originally Posted by Cobb

Now we got another eco mod, indexed plugs!!!!!

I wonder if the plugs for the first generation Insight will work with ours? As long as the thread pattern is the same, that's a good start. Next would trying to figure out which indexing position is ideal for each cylinder.

Then again, perhaps indexing will provide zero benefits for the Insight 2? Come to think of it, since we have 2 plugs for each cylinder, I don't see how indexing would make it any more efficient. If it would, you'd think the engineers at Honda would have incorporated it into the second gen.

[Cobb]

I think we will benefit more from -multi electrode plugs vs index. just got to get the temp, thread, terminal.

There goes my day off from work tomorrow, bent over under the hood of m Honda swapping plugs.


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[firsthonda]

Originally Posted by Cobb

I think we will benefit more from -multi electrode plugs vs index. just got to get the temp, thread, terminal.

Multi electrode you say? Interesting.

This is worth looking into as potential eco mod. As it stands we have 2 electrodes per cylinder for efficient combustion. What would happen if you'd introduce a couple more? Could have negative repercussions. Like you said, we'd have to figure out the right temp etc.

[firsthonda]

What is our spark plug gap?

[kjanracing]

[QUOTE=firsthonda

Then again, perhaps indexing will provide zero benefits for the Insight 2? Come to think of it, since we have 2 plugs for each cylinder, I don't see how indexing would make it any more efficient. If it would, you'd think the engineers at Honda would have incorporated it into the second gen.[/QUOTE]

I believe this quote from Firsthonda to be accurate.

Cobb, the only thing putting in colder plugs is going to do is replace your old plugs. They wont make a bit of difference, timing wise. The mapping doesn't
know what heat range plug is in there. OTOH, if you went with a hotter plug with a heat range high enough to cause preignition, then the timing would be cut back, but that would be just a dumb thing to do. To paraphrase Firsthonda, if a colder plug would make a difference, wouldn't the engineers have gone with that heat range int he first place?

[Willie Williford]

kj is right. Heat selection from the factory is for overall type driving, not racing.
Modern ECU take that into consideration.
There are multi electrode plugs available, 2-3 electrodes for the FIT at least, don't know
if they would fit in the G2. The threads on the majority of the plugs now are all standard.
I'll measure the reach on the FIT tomorrow. Need someone to measure the G2 reach.
HTH
Willie

[Cobb]

The "engineers" that made the second generation of the insight made it twice as big as the previous model and only capable of a third of its fuel economy.

I think the lack of an index plug should show how consideration was used when other Hondas used index plugs on other models.

Originally Posted by kjanracing

To paraphrase Firsthonda, if a colder plug would make a difference, wouldn't the engineers have gone with that heat range int he first place?

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